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2018 Elantra Sport 6MT Electric Blue
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I have now been using 91 for the past year. most of the time i use shell because of the tmobile tuesday 15 cent discount lol
 

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I'm locking this thread because this discussion has already been had. Anyone saying that the car doesn't need anything more than 87 is technically correct, but the car will absolutely, positively run better and be less prone to detonation with higher octane gas.

To the person that said that the car isn't prone to detonation because of 18 psi of boost... you have no idea what you're talking about and I'm going to request that you refrain from talking on this subject until you educate yourself.
 
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